Code style: move private constructors for singleton classes to the top of the file

velocity/src/main/java/me/lucko/luckperms/velocity/service/CompatibilityUtil.java

@@ -33,6 +33,7 @@ import java.util.Objects;
  * Utility class for converting between Velocity and LuckPerms tristate classes
  */
 public final class CompatibilityUtil {
+    private CompatibilityUtil() {}
 
     public static com.velocitypowered.api.permission.Tristate convertTristate(Tristate tristate) {
         Objects.requireNonNull(tristate, "tristate");
@@ -58,6 +59,4 @@ public final class CompatibilityUtil {
         }
     }
 
-    private CompatibilityUtil() {}
-
 }